89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/* tag: forth source loader
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*
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* Copyright (C) 2004 Stefan Reinauer
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*
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* See the file "COPYING" for further information about
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* the copyright and warranty status of this work.
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*/
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#include "config.h"
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#include "kernel/kernel.h"
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#include "libopenbios/bindings.h"
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#include "libopenbios/sys_info.h"
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#include "libc/diskio.h"
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#include "libopenbios/forth_load.h"
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#define printk printk
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#define debug printk
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static int fd;
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static char *forthtext=NULL;
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int is_forth(char *forth)
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{
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return (forth[0] == '\\' && forth[1] == ' ');
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}
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int forth_load(ihandle_t dev)
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{
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char magic[2];
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unsigned long forthsize;
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int retval = -1;
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/* Mark the saved-program-state as invalid */
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feval("0 state-valid !");
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fd = open_ih(dev);
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if (fd == -1) {
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goto out;
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}
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if (read_io(fd, magic, 2) != 2) {
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debug("Can't read magic header\n");
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retval = LOADER_NOT_SUPPORT;
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goto out;
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}
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if (!is_forth(magic)) {
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debug("No forth source image\n");
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retval = LOADER_NOT_SUPPORT;
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goto out;
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}
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/* Calculate the file size by seeking to the end of the file */
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seek_io(fd, -1);
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forthsize = tell(fd);
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forthtext = malloc(forthsize+1);
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seek_io(fd, 0);
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printk("Loading forth source ...");
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if ((size_t)read_io(fd, forthtext, forthsize) != forthsize) {
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printk("Can't read forth text\n");
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goto out;
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}
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forthtext[forthsize]=0;
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printk("ok\n");
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// Initialise saved-program-state
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PUSH((ucell)forthtext);
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feval("load-state >ls.entry !");
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PUSH((ucell)forthsize);
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feval("load-state >ls.file-size !");
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feval("forth load-state >ls.file-type !");
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feval("-1 state-valid !");
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retval=0;
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out:
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//if (forthtext)
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// free(forthtext);
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return retval;
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}
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void
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forth_init_program(void)
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{
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// Currently not implemented
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feval("0 state-valid !");
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}
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